The neurotransmitter released from the nerve terminus at the neuromuscular junction is __________.
A. troponin
B. Ca2+
C. tropomyosin
D. acetylcholine
D. acetylcholine
Biology & Microbiology
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The most prominent known role in the opening and closing of stomata is played by____ ions
a. Ca2+ b. Cl? c. K+ d. NH4+ e. Na+
Biology & Microbiology
Bicarbonate is an important buffer in blood and its concentration is regulated by the
A) heart. B) lungs. C) liver. D) kidneys. E) pancreas.
Biology & Microbiology
During signal transduction involving G protein and cAMP, what do protein kinases add to target proteins?
a. enzyme b. substrates c. calmodulin d. calcium ions e. phosphate groups
Biology & Microbiology
Aldosterone stimulates the reabsorption of sodium ions here
A) proximal convoluted tubule B) glomerular capsule C) loop of the nephron D) distal convoluted tubule and collecting duct
Biology & Microbiology